I'm getting this message in my logs, about an IOMMU error, on both 4.0.2 and the F31-based 4.1 build. I'm as certain as I can be that the IOMMU is enabled in BIOS. I'm having issues with passthru and I'm wondering if this might be the cause.
In dom0 kernel logs: AMD IOMMUv2 driver by Joerg Roedel <jroe...@suse.de AMD IOMMUv2 functionality not available on this system ... kfd kfd: Initialized module ... kfd kfd: Allocated 3969056 bytes on gart Virtual CRAT table created for GPU Parsing CRAT table with 1 nodes Creating topology SYSFS entries Topology: Add dGPU node [0x15dd:0x1002] kfd kfd: error getting iommu info. is the iommu enabled? <-- red kfd kfd: Error initializing iommuv2 <-- red Creating topology SYSFS entries kfd kfd: device 1002:15dd NOT added due to errors <-- red 1002:15dd is the integrated GPU on my Ryzen 2500U. In xl dmesg (XEN) AMD-Vi: Disabled HAP memory map sharing with IOMMU (XEN) AMD-Vi: IOMMU Extended Features: (XEN) - Peripheral Page Service Request (XEN) - NX bit Supported (XEN) - Guest Translation (XEN) - Invalidate All Command (XEN) - Guest APIC supported (XEN) - Performance Counters (XEN) AMD-Vi: IOMMU 0 Enabled. https://community.amd.com/thread/170292 This thread recommends creating /etc/udev/rules.d/kfd.rules with MODE="0666". Qubes 4.1 has file /usr/lib/udev/rules.d/50-udev-default.rules which contains: SUBSYSTEM=="kfd", GROUP="render", MODE="0666" although 4.0.2 appears to have no such file. However I get the same error even on 4.1 so I don't think that's the fix. https://unix.stackexchange.com/questions/263901/kfd-error-getting-iommu-info This thread says add kernel parameter "iommu=pt" but I don't know if that's effective or safe in Qubes, because Xen handles the IOMMU instead of the kernel I think. I'm not really sure what that parameter does. https://bugzilla.redhat.com/show_bug.cgi?id=1404139 This thread says it's not a bug, it's just because the system doesn't support IOMMUv2 and amdkfd (whatever that is) requires IOMMUv2 (whatever that is) for HSA (whatever that is). I don't really know what any of that means. Is it an error? Should I be worried? Could it be causing my passthru problems? Or does it just mean that my GPU is not protected by the IOMMU (same as iommu=no-igfx on Intel) and I don't have to worry about it? -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/22518f58b4489a980ec75ccce0e7d71b%40disroot.org.
